Improvement in the manufacture of sheet and plate iron



UNITED STATES PATENT OFFICE.

N. C. GRIDLEY, OF MILWAUKEE, WISCONSIN.

IMPROVEMENT IN THE MANUFACTURE OF SHEET AND PLATE IRON.

specification forming part of Letters Patent No. 93,083. dated July 27,1869.

To all whom it may concern:

Be it known that I, NELsoN G. GRIDLEY, of the city of Milwaukee, countyof -Milwaukee, and State of Wisconsin, have invented certain new anduseful Improvements in the Mannfacture of Sheet and Plate Iron; and I dohereby declare that the following is afull, clear, and exact descriptionthereof.

To enable others skilled in the art to construct and use my invention, Iwill proceed to describe it.

My invention relates to a process in the manufacture of sheet and plateiron for removing the scale and slag from the surfaces thereof, and atthe same time making a uniform hardened surface, susceptible of a highdegree of finish, thereby preventing or greatly lessening the tendencyto oxidation and corrosion.

The sheet or plate iron is first rolled in the usual manner, slightlythicker than the desired merchantable thickness, and without bein gpassed through the usual finishing-rollers, and is then fed to, by meansof and between two or more rollers, commonly used, of the material,length, and diameter desired, or by any other known method therefor, andthe surfaces thereof brought in contact with, and under pressure of, asoftsteel roller, orits equivalent, of the length and diameter desired,revolving with great rapidity in an opposite direction to the feedingrollers or machinery. The action of this soft steel roller upon andagainst the surface of the sheet and plate iron is that of abrasion,cutting slight particles or a portion therefrom, removing the scale andslag, and at the same time hardening the surface thereof, making ituniform, and firmly covering and closing the pores of the iron,

thereby preventing or greatly lessening the tendency to oxidation andcorrosion.

The surfaces of the sheet and plate iro thus treated can be brought to ahigh degree of finish or polish under the emery-wheel or other knownmethods. If such surfaces should become, under the action of the softsteel roller,

by use of the emery-Wheel, or by rolling or by annealing by any of theknown processes therefor, and without materially changing the characterof the surfaces aforesaid. The desired color may also be given theretoby any of the known processes therefor.

I do not claim the construction or combination of any machinery in themanufacture of sheet and plate iron to produce the results specified;but

What I do claim, and desire to secure by Letters Patent, is

1. The process of removing the scale and slag from, and at the same timehardening the surfaces of, sheet and plate iron, by means of one or moresoft steel rollers, or their equiva lent, substantially in the mannerdescribed.

2. In the process of manufacturing sheet and plate iron, the use of oneor more soft steel rollers, or their equivalents, for removing the scaleand'slag, and atthe same time making a uniform hardened surface,preparatory to itsreceiving the desired finish and color, substantiallyin the manner and for the purpose described.

- N. C. GRIDLEY. Witnesses: I

SAML. I. I RIDGE, F. '1. DAY.

